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Mesostructured Zeolitic Materials, and Methods of Making and Using the Same

a technology of zeolitic materials and zeolitic zeolitic, which is applied in the direction of liquid organic insulators, metal/metal-oxide/metal-hydroxide catalysts, water/sewage treatment by ion exchange, etc. it can solve the problems of not possessing strong acidity, not having strong acidity, and limited applications of zeolitic materials, etc., to enhance the sulfur tolerance, metal tolerance, and/or hydrothermal stability of inorganic materials

Active Publication Date: 2007-10-04
MASSACHUSETTS INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a method of preparing a mesostructured zeolite with a unique structure and pore arrangement. The method involves adding a zeolite to a medium containing a base and optionally a surfactant, and optionally a swelling agent. The resulting material can be in the form of a nanotube, nanorod, or nanowire. The method can also involve hydrothermally treating the medium, washing, and drying the resulting material. The mesostructured zeolite has a hexagonal pore arrangement and a wall thickness ranging from 1 to 5 nm. The invention also relates to the mesostructured zeolite prepared by the method.

Problems solved by technology

However, their applications are limited by their small pore openings, which are typically narrower than 1 nm.
However, unlike zeolites, MCM-41-type materials are not crystalline, and do not possess strong acidity, high hydrothermal stability and high ion-exchange capability, which are important for certain catalytic applications.
However, due to the lack of long-range crystallinity in these materials, their acidity was not as strong as those exhibited by zeolites.
Previous attempts to prepare mesostructured zeolitic materials have been ineffective, resulting in separate zeolitic and amorphous mesoporous phases.
Moreover, some authors pointed out the difficulty of synthesizing thin-walled mesoporous materials, such as MCM-41, with zeolitic structure, due to the surface tension associated with the high curvature of the mesostructure.

Method used

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  • Mesostructured Zeolitic Materials, and Methods of Making and Using the Same
  • Mesostructured Zeolitic Materials, and Methods of Making and Using the Same
  • Mesostructured Zeolitic Materials, and Methods of Making and Using the Same

Examples

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Effect test

example 1

[0337] Synthesis of H-Y[MCM-41]—0.79 g of zeolite H-Y (Zeolyst CBV-720 Si / Al=15) were stirred in 50 mL of a 0.37 M NH4OH solution containing 0.55 g of CTAB, for 20 minutes, after which time the synthesis mixture was hydrothermally treated at 150° C. for 10 hours. The solid was filtered, washed, and finally ramped in nitrogen at 5° C. / min until 550° C., and then switched to air for 4 hours. Similar conditions were used to calcine all of the samples.

[0338] Alternatively, 1 g of H-Y (Zeolyst CBV-720 Si / Al=15) was stirred for in 30 mL of a 0.09 M tetramethylammonium hydroxide (TMA-OH) solution. Then 0.5 g of cetyltrimethylammonium bromide (CTAB) was added. After 30 minutes of stirring the suspension was hydrothermally treated for 20 hours at 150° C. Structural parameters are presented in Table 1.

example 2

[0339] Synthesis of H-MOR[MCM-41]—2.0 g of zeolite H-MOR (calcined Zeolyst CBV21A Si / Al=10) was stirred in 50 mL of 0.27 M TMA-OH solution. Afterwards, 1.0 g of CTAB was added. After other 30 minutes of stirring the synthesis solution was hydrothermally treated at 150° C. for 20 hours. Structural parameters are presented in Table 1.

example 3

[0340] Synthesis of H-ZSM-5[MCM-41]—1.0 g of NH4-ZSM-5 (Zeolyst CBV3024E Si / Al=15) was stirred in 50 mL of 0.8 M HF solution for 4 hours. This suspension was added to a solution containing 0.69 g of CTAB, and stirred for 30 minutes. The resulting synthesis mixture was basified by slowly adding 2.5 g of a 30% NH4OH solution. Finally, it was hydrothermally treated at 150° C. for 20 hours. Structural parameters are presented in Table 1. The wall thickness was determined by the standard method within the art by substracting the distance between two pore centers (ao, obtained via X-ray diffraction) and the pore size (determined by N2 adsorption).

TABLE 1Structural parameters for the mesostructured zeolites.ao (nm)Pore diameter (nm)Wall thickness (nm)H-Y[MCM-41]4.22.61.6H-MOR[MCM-41]4.72.52.2H-ZSM-5[MCM-41]4.82.62.2

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Abstract

One aspect of the present invention relates to mesostructured zeolites. The invention also relates to a method of preparing mesostructured zeolites, as well as using them as cracking catalysts for organic compounds and degradation catalysts for polymers.

Description

RELATED APPLICATIONS [0001] This application claims the benefit of and priority to U.S. patent application Ser. No. 10 / 830,714, filed on Apr. 23, 2004, and entitled “Mesostructured Zeolitic Materials, and Methods of Making and Using the Same.” This application also claims benefit and priority to the PCT application entitled “Mesostructured Zeolitic Materials, and Methods of Making and Using the Same,” International patent application serial No. PCT / US05 / 14129, filed on Apr. 22, 2005.GOVERNMENT FUNDING [0002] This invention was made with support under Grant Number DAAD19-02-D0002, awarded by the Army Research Office; the government, therefore, has certain rights in the invention.BACKGROUND OF THE INVENTION [0003] Zeolites and related crystalline molecular sieves are widely used due to their regular microporous structure, strong acidity, and ion-exchange capability. van Bekkum, H., Flanigen, E. M., Jacobs, P. A., Jansen, J. C. (editors), Introduction to Zeolite Science and Practice, 2...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01J29/04B01J20/18B01J29/00B01J29/08B01J29/18B01J29/40B01J29/80C01B39/02C01B39/04C10G1/08C10G11/02C10G11/05C10G11/18
CPCB01J20/18Y10T428/26B01J29/005B01J29/0308B01J29/041B01J29/084B01J29/106B01J29/18B01J29/40B01J29/80B01J2229/62B82Y30/00C01B39/02C01B39/023C01B39/026C01B39/04C10G1/086C10G11/02C10G11/05C10G11/18C10G45/04C10G47/02C10G2300/1033C10G2300/1074C10G2300/1096C10G2400/02C10G2400/20B01J20/186C01B39/00B01J29/06B82Y40/00
Inventor GARCIA-MARTINEZ, JAVIER
Owner MASSACHUSETTS INST OF TECH
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